Here's a look at tonight's sci-fi TV:
Fringe, "Jacksonville" - Olivia must confront her shocking past in order to stop two worlds from colliding in the Fringe winter finale. After a batch of intriguing stand-alone episodes, tonight's ep brings the warring universes storyline to the forefront. Let's hope its good enough to sustain us through the coming Fringe-free months. (9 p.m. ET on Fox)
The Vampire Diaries, "Children of the Damned" – Dexter's James Remar guest stars as Stefan and Damian's dad as we head back to the 1800s to investigate the origins of the brothers' blood lust. (8 p.m. ET on The CW)
Supernatural, "The Song Remains the Same" – Anna travels back in time to snuff out Sam's parents to prevent him from ever existing. Naturally, the boys head to the past to protect mom and pops from her evil plan. (10 p.m. ET on The CW)
Head after the jump for clips and more TV picks.